package com.xiaoq;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.web.ErrorAttributes;
import org.springframework.boot.autoconfigure.web.ErrorController;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.servlet.ModelAndView;

import com.xiaoq.coms.GenericResponse;

@RestController
public class CustomErrorController implements ErrorController {

	private static final Logger LOG = LoggerFactory.getLogger(CustomErrorController.class);

	private static final String PATH = "/error";

	@Autowired
	private ErrorAttributes errorAttributes;

	/**
	 * Supports the HTML Error View
	 * 
	 * @param request
	 * @return
	 */
	@RequestMapping(value = PATH, produces = "text/html")
	public ModelAndView error(HttpServletRequest request, HttpServletResponse response) {
		return new ModelAndView("error", getErrorAttributes(request, false));
	}

	/**
	 * Supports other formats like JSON, XML
	 * 
	 * @param request
	 * @return
	 */
	@RequestMapping(value = PATH)
	@ResponseBody
	public ResponseEntity<?> error(HttpServletRequest request) {
		Map<String, Object> body = getErrorAttributes(request, getTraceParameter(request));
		HttpStatus status = getStatus(request);
		GenericResponse resp = new GenericResponse(status.value() + "", (String)body.get("message"));
		resp.setRc("" + status.value());
		return new ResponseEntity<>(resp, status);
	}

	@Override
	public String getErrorPath() {
		return PATH;
	}

	private boolean getTraceParameter(HttpServletRequest request) {
		String parameter = request.getParameter("trace");
		if (parameter == null) {
			return false;
		}
		return !"false".equals(parameter.toLowerCase());
	}

	private Map<String, Object> getErrorAttributes(HttpServletRequest request, boolean includeStackTrace) {
		RequestAttributes requestAttributes = new ServletRequestAttributes(request);
		Map<String, Object> map = this.errorAttributes.getErrorAttributes(requestAttributes, includeStackTrace);
		String URL = request.getRequestURL().toString();
		
		LOG.warn("[XIAOQ] [SYSTEM] [ERROR] status: " + map.get("status") + ", url: " + URL);
		
		return map;
	}

	private HttpStatus getStatus(HttpServletRequest request) {
		Integer statusCode = (Integer) request.getAttribute("javax.servlet.error.status_code");
		if (statusCode != null) {
			try {
				return HttpStatus.valueOf(statusCode);
			} catch (Exception ex) {
			}
		}
		return HttpStatus.INTERNAL_SERVER_ERROR;
	}
}